Drilling machine



D 20, 1955 A. J. FAUSEK ET AL 2,727,413

DRILLING MACHINE Filed March 18, 1955 2 Sheets-Sheet l FIG.

INVENTORS ARTHUR J. FAUSEK IRWING F. FAUSEK WILLIS L.. REEDY EMERY F. C PELAND E M D c- 2 1955 A. .1. FAUSEK ET AL DRILLING MACHINE 2 SheetsSheet 2 Filed March 18, 1953 FIGS.

FIG. 7.

United States Patent DRILLING MACHINE Arthur J. Fausek and Irwing F. Fausek, Clayton, Willis L. Reedy, St. Louis, and Emery F. Copeland, Webster Groves, Mo.; said Willis L. Reedy and said Emery Copeland assignors to said Arthur J. Fansek and said Irving F. Fausek Application March 18, 1953, Serial No. 343,092

8 Claims. (Cl. 77-323) This invention relates generally to drilling machines and more specifically to a machine of the type mentioned which is electrically controlled and air operated and is adapted for automatically drilling holes in articles to desired depths, depending on the requirements of speed and the characteristics of the material being drilled, the predominant object of the invention being to provide a drilling machine of the type mentioned which is relatively simple in construction and arrangement and is capable of performing its intended function in an improved and highly eflicient manner.

Fig. 1 is a fragmentary side elevation of the improved drilling machine of this invention, a portion thereof being shown in section.

Fig. 2 is a plan view of the drilling machine shown in Fig. i.

Fig. 3 is a fragmentary section taken on line 3--3 of Fig. 2.

Fig. 4 is a fragmentary section taken on line 44 of Fig. 2.

Fig. 5 is a fragmentary, vertical section taken on line 5-5 of Fig. l.

Fig. 6 is an enlarged, horizontal section taken on line 6-6 of Fig. 1.

Fig. 7 is an enlarged, vertical section taken on line 77 of Fig. 2.

Fig. 8 illustrates a fragment of a cam which forms an important feature of the invention.

Fig. 9 is a diagrammatical view illustrating the complete machine of thisv invention.

In the drawings, wherein is shown for purposes of illustration, merely, one embodiment of the invention, A designates generally the improved drilling machine of this invention. The drilling machine A comprises a base member 1 which preferably, though not necessarily, is in the form of a heavy plate, which supports a pair of bearing structures 2 and 3 of suitable construction which are bolted or otherwise secured to the base member 1 at points adjacent to opposite side edges thereof. These bearing structures support for rotation a shaft 4 which extends transversely of the base member 1, and fixedly mounted on said shaft 4 for rotation therewith is a contact wheel 5. The shaft 4 isv coupled by a coupling 6 to the motor shaft 7 of an electric motor 8 and said contact wheel has projected laterally from a side face thereof adjacent to its circumferential face, a multiplicity of pins 9. Also, the contact wheel 5 has fixed to its circumfereutial face a cam 10 which serves a purpose to be hereinafter set forth. The shaft 4 has fixedly mounted thereon for rotation therewith a cam 11 which is shaped in side elevation as is shown to good advantage in Fig. 1, the precise shape of the marginal face of said cam 11 to be hereinafter set forth.

The drilling machine of this invention includes a carriage 12 which is provided with a head 13 to which opposed side members 14 of the carriage are secured by bolts 15, said opposed side members being extended forwardly from said head and having fixedly mounted between said opposed side members at the forward ends thereof a member 16. Also, the opposed side members 14 of the carriage 12 are provided with depressed portions 17 which permit of the carriage 12 reciprocating relative to the shaft 4 for a purpose to be hereinafter set forth, said depressed portions of the opposed side members of the carriage extending beneath said shaft 4, as is shown in Pig. 1, and forward portions of said opposed side members being supported for reciprocation by a bearing structure 18 which in turn is supported by the base member 1. The carriage i2 is connected to a piston 19 disposed for double-acting reciprocation within an air cylinder 26, said connecting being made by a tie rod 21 which is screw threadedly connected to the head 13 at one end and is fixed to the piston 19 at its opposite end. The head 13 has formed therein an opening 22 in which is disposed the spindle 23 of a cam contactor 24, said cam contactor having a head portion 24 which is shaped as is shown to good advantage in Fig. 7 and which is adapted to contact at its forward end with the peripheral face of the cam 11.

The cam contactor 24 is provided with an annular groove that receives a packing ring 25 which serves to provide fluid-tight contact between the circumferential face of the spindle 23 of the cam contactor and the face of the bore of the opening 22, and said cam contactor is provided with a recess 25 which receives a portion of a coil spring 27, said coil spring contacting at one end thereof with the base wall of the recess 25 and at its opposite end with the base Wall of the opening 22. A check valve structure 23 is associated with said head 13 of the carriage 12, said check valve structure comprising a housing 29 provided with a screwthreaded stem 30 which is screwed into a screwthreaded opening formed in said head, said screwthreadedly opening communicating with a tapered opening 31 formed in said head, and an angular passageway 32 is provided in said head, one end of which communicates with said tapered opening and the opposite end thereof communicating with the opening 22. The housing 29 of the check valve structure 28 is provided with a passageway 33 which is closed by ball valve 34 that is urged toward a valve seat 35 by a coil spring 36, said coil spring contacting at one end thereof with the ball valve and at its opposite end with an apertured plug 37 which is screwed into the lower end of the stem 3!). The housing 2? of the check valve structure 23 is provided at its top with an externally screwthreaded stem which screwthreadedly receives a reservoir 33 having a hinged cover 39, said reservoir and the passageways commnnic '-g therewith having a suitable oil disposed therein for a purpose to be hereinafter referred to. Attention is directed to the fact that a bleeder port 33' is provided which bleeds oil about the ball valve 3 5 in the check valve housing to permit oil to bleed around said ball valve into the reservoir 38 even when said ball valve is seated on its seat.

Secured to the base member by bolts W, or otherwise, is a bearing structure 51 which is provided with a pair of upstanding portions that s ort rotation a drill spindle 53, said drill spindle 's forward end being provided with a chu that receives a drill bit 45 for attachment of said bit to said drill spindle for rotation therewith. The drill spindle at its rear portion is provided witlan extension 43' and t. s extension projects into a cavity form the in; in which cavity a ball bearing struct :6 ted (rig 6), said ball bearing structure comprising raceway 47 rotatable with extension 43 of the drill spindle, and a bail raceway tcunted stations; with respect to the member 16, with ball bearings i9 disposed between said ball raceways. The cavity 16 of the memher 16 is closed at the rear side of said member 16 by a cap 50 and a nut 51 is mounted on the screwthreaded end portion of the extension 43 of the drill spindle 43. The drill spindle is driven by a motor 43a through the aid of a transmission belt 43b.

In describing the operation of the improved drilling machine of this invention attention is directed to Fig. 9 which illustrates diagrammatically the entire machine, and in this View 52 designates a main control switch which when closed supplies electrical energy to all of the electrical devices of the circuit. At the start of a drilling cycle the double-acting piston 19 in the air cylinder 20' is in fully retracted position, and an extension -53 'mounted on the carriage 12 engages the movable contact of a switch 54, holding it in a closed position. A cam 10 on contact wheel 5 is engaged with contact switch 59 thereby holding said contact switch open, said ,contact' switch 59 in turn being connected to the sole- 56 of the combination solenoid-operated air valve C to the rear end of air cylinder 20 to force the piston 19, carriage 12, drill spindle 43, and drill bit 45 forwardly. Forward motion of the drill bit 45 is controlled by the cam contactor 23 which moves with the carriage 12, the

head portion 24 of the cam contactor engaging the cam 11 at a predetermined point on the peripheral face of said cam. The cam is rotated by the motor 8 and when the head portion of the cam contactor 23 engages the peripheral face of the rotating cam, it follows the contour of the cam for a predetermined distance, which is governed by the contact wheel 5 mounted on the same shaft on which the cam is mounted. The pins of the contact wheel 5 are arranged in a definite relation with respect to the contour of the peripheral face of the cam 11, and these pins engage the contact switch 57 and energize combination solenoid-operated air valve C, closmg off air to rear of air cylinder 20 and allowing air to flow to the forward end of the cylinder and force the piston of the air cylinder rearwardly thereof so as to retract the drill hit. As soon as the extension 53 of the carriage 12 engages the contact switch 54 the flow of air is reversed through operation of the solenoid-perated valve C to force the piston 19 of the air cylinder 20 forwardly, thereby starting a new cycle. The number of cycles required to drill a hole of a desired depth is controlled by the contour of the cam 11.

The cam 11 is designed so that it is engaged by the cam contactor 23 which rides with the cam at a uniform rate of speed, following the contour of the cam, which allows the carriage 12, drill spindle 43, and drill bit 45, to move forward into the work W a definite depth. Each tune the cam contactor 23 contacts the cam on a new drilling cycle it engages it on a predetermined decrease in cam d ameter, because of the shape of the cam, thereby allowmg the drill to go deeper into the work at predetermined increments of depth. The cam contour is also designed so that on each successive drilling cycle the drill is not allowed to strike the bottom of the previously drilled hole but moves into the bottom of said preceedmg hole at a unifolm rate of speed. This elimmates the shock of the drill striking the bottom of the drilled hole and provides for more accurate drillin and less drill bit breakage.

Also, the contact wheel 5 has a cam mounted thereon which controls the stopping of the equipment at a proper point after a hole has been completely drilled so that said equipment is in proper position to start drilling another hole. One portion of said cam 10 engages a contact switch 59 thereby energizing the solenoid valve 55 which shuts ofi the air supply to the system, the air supply being shut ofi at a time when the piston 19 in the air cylinder 20 is in fully retracted position. Another portion of the cam 10 engages and operates the contact switch 60'which shuts off the motor 8 so that the cam 11 stops in proper position to be ready for the start of another drilling operation. By referring to Fig. 8 it will be noted that the reference character a designates the drilling period, while the reference character b designates the retraction period. Likewise the reference character 0 in Fig. 8 designates an angle which is a part of the retraction period and it prevents the drill bit from striking the bottom of the previously drilled hole, while the reference character d designates the depth of the drilled hole. When the head 24 of the cam contactor 24 contacts with the peripheral face of the cam 11 at the beginning of a drilling operation it strikes a surface portion c of said cam which arrests forward movement of the drill bit short of a point where the leading end of said drill bit would strike the bottom of the previously drilled hole. Then as the cam 11 rotates with the portion 24 of the cam contactor in contact with the peripheral face thereof, the nose of said portion 24 enters a depressed portion a of the cam permitting the carriage 12 to move forwardly and the drill bit to perform a drilling operation in the work. The bleeder port 33 bleeds oil past'the ball valve 34 when said ball valve is closed, and thereby provides a hydraulic cushion that permits the carriage 12 to move forwardly slightly even though the cam contactor is held stationary because of contact thereof with the peripheral face of the cam 11.

We claim:

1. A drilling machine comprising a reciprocatory carriage, means for subjecting said carriage to reciprocatory movement, a drill spindle provided with a drill bit movable in a reciprocatory manner with said carriage and supported by said carriage for axial rotation with respect thereto, means for rotating said drill spindle, a cam, a shaft on which said cam is mounted for rotation therewith, means for subjecting said shaft and cam to rotation, a cam contactor for contacting said cam in a manner to control movement of said carriage and the drill spindle and drill bit associated therewith, said cam contactor being in the form of a plunger disposed in a recess formed in a part of said carriage, an oil reservoir arranged in communication with said recess, and a check valve interposed between said recess and said reservoir.

2. A drilling machine comprising a reciprocatory carriage, means for subjecting said carriage to reciprocatory movement, a drill spindle provided with a drill bit movable in a reciprocatory manner with said carriage and supported by said carriage for axial rotation with respect thereto, means for rotating said drill spindle, a cam, a shaft on which said cam is mounted for rotation therewith,

means for subjecting said shaft and cam to rotation, a cam contactor for contacting said cam in a manner to control movement of saidcarriage and the drill spindle and drill bit associated therewith, said cam contactor being in the form of a plunger disposed in a recess formed in a part of said carriage, an oil reservoir arranged in communication with said recess, acheck valve interposed between said recess and said reservoir, and a bleeding port for conducting oil around said check valve when said check valve is closed.

3. A drilling machine comprising a'reciprocatory carriage, means for subjecting said carriage to reciprocatory movement, a drill spindle provided with a drill bit movable in a reciprocatory manner with said carriage and supportedby said carriage for axial rotation with respect thereto, means for rotating said drill spindle, a cam, a shaft on which said cam is mounted for rotation .therewith, means for subjecting said shaft and cam to rotation, a cam contactor for contacting said cam in a manner to control movement of said carriage and the drill spindle and drill bit associated therewith, said cam contactor being in the form of a plunger disposed in a recess formed in a part of said carriage, an oil reservoir arranged in communication with said recess, a spring-urged check valve interposed between said recess and said reservoir, and a bleeding port for conducting oil around said check valve when said check valve is closed.

4. A drilling machine comprising a reciprocatory carriage, means comprising a double-acting piston and cylinder assembly for subjecting said carriage to reciprocatory movement, a drill spindle provided with a drill bit movable in a reciprocatory manner with said carriage and supported by said carriage for axial rotation with respect thereto, means for rotating said drill spindle, a cam, a shaft on which said cam is mounted for rotation therewith, means for subjecting said shaft and cam to rotation, a cam contactor for contacting said cam in a manner to control movement of said carriage and the drill spindle and drill bit associated therewith, a plurality of solenoid-operated air valves for controlling movement of air to the opposite ends of said cylinder of said piston and cylinder assembly, and means for electrically causing actuation of said plurality of solenoid-operated air valves in proper timed relation.

5. A drilling machine comprising a reciprocatory carriage, means comprising a double-acting piston and cylinder assembly for subjecting said carriage to reciprocatory movement, a drill spindle provided with a drill bit movable in a reciprocatory manner with said carriage and supported by said carriage for axial rotation with respect thereto, means for rotating said drill spindle, a cam, a shaft on which said cam is mounted for rotation therewith, means for subjecting said shaft and cam to rotation, a cam contactor for contacting said cam in a manner to control movement of said carriage and the drill spindle and drill bit associated therewith, a plurality of solenoid-operated air valves for controlling movement of air to the opposite ends of said cylinder of said piston and cylinder assembly, and means for electrically causing actuation of said plurality of solenoid-operated air valves in proper timed relation, the last-mentioned means including an element mounted on said shaft on which said cam is mounted and operable to actuate switches which control actuation of certain of said solenoid-operated air valves.

6. A drilling machine comprising a reciprocatory carriage, means comprising a double-acting piston and cylinder assembly for subjecting said carriage to reciproca tory movement, a drill spindle provided with a drill bit movable in a reciprocatory manner With said carriage and supported by said carriage for axial rotation with respect thereto, means for rotating said drill spindle, a cam, a shaft on which said cam is mounted for rotation therewith, means for subjecting said shaft and cam to rotation, a cam contactor for contacting said cam in a manner to control movement of said carriage and the drill spindle and drill bit associated therewith, a plurality of solenoid-operated air valves for controlling movement of air to the opposite ends of said cylinder of said piston and cylinder assembly, and means for causing actuation of said plurality of solenoid-operated air valves in proper timed relation, the last-mentioned means including an element mounted on said shaft on which said cam is mounted for rotation therewith and operable to electrically actuate switches which control actuation of certain of said solenoid-operated air valves.

7. A drilling machine comprising a reciprocatory carriage, means comprising a double-acting piston and cylinder assembly for subjecting said carriage to reciprocatory movement, a drill spindle provided with a drill bit movable in a reciprocatory manner with said carriage and supported by said carriage for axial rotation with respect thereto, means for rotating said drill spindle, a cam, a shaft on which said cam is mounted for rotation therewith, means for subjecting said shaft and cam to rotation, a cam contactor for contacting said cam in a mannet to control movement of said carriage and the drill spindle and drill bit associated therewith, a plurality of solenoid-operated air valves for controlling movement of air to the opposite ends of said cylinder of said piston and cylinder assembly, and means for causing actuation of said plurality of solenoid-operated air valves in proper timed relation, the last-mentioned means including an element mounted on said shaft on which said cam is mounted for rotation therewith and operable to electrically actuate switches which control actuation of certain of said solenoid-operated air valves, and said lastmentioned means including also a switch for controlling actuation of another of said solenoid-operated air valves which is engaged and closed by contact therewith of a part of said carriage when said carriage is in its retracted position.

8. A drilling machine comprising a reciprocatory carriage, means comprising a double-acting piston and cylinder assembly for subjecting said carriage to reciprocatory movement, a drill spindle provided with a drill bit movable in a reciprocatory manner with said carriage and supported by said carriage for axial rotation with respect thereto, means for rotating said drill spindle, a cam, a. shaft on which said cam is mounted for rotation therewith, means for subjecting said shaft and cam to rotation, a cam contactor for contacting said cam in a manner to control movement of said carriage and the drill spindle and drill bit associated therewith, a plurality of solenoidoperated air valves for controlling movement of air to the opposite ends of said cylinder of said piston and cylinder assembly, and means for electrically causing actuation of said plurality of solenoid-operated air valves in proper timed relation, the last-mentioned means including an element mounted on said shaft on which said cam is mounted for rotation therewith and operable to actuate switches which control actuation of certain of said solenoid-operated air valves, and said last-mentioned means including also a switch for controlling actuation of another of said solenoid-operated air valves which is engaged and closed by contact therewith of a part of said carriage when said carriage is in its retracted position, said element mounted on the shaft on which said cam is mounted serving also to actuate switches which control said means for rotating said cam shaft and said means for rotating said drill spindle and the drill bit related thereto.

References Cited in the file of this patent UNITED STATES PATENTS 13,383 Conner et a1 Aug. 7, 1855 1,069,995 Anderson Aug. 12, 1913 1,493,428 Bucknam May 6, 1924 2,324,374 Eden July 13, 1943 2,460,156 Vanderhide Jan. 25, 1949 FOREIGN PATENTS 55,472 Germany Feb. 28, 1891 

